String unknown to JSON in Java

Question

I\'ve got a string from an URL which I know is formatted as a JSON but I don\'t know the field that can change and the size. I try to parse it into a JSON Object to be able to i

Answer 1

My best experience with mapping is com.fasterxml.jackson

use to make a Json String from your class (whatever the subclasses, as long as all have appropriate getters and setters, and an empty (public) constructor)

public String toJson() {
    final ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);
    StringWriter stringEmp = new StringWriter();
    try {
        objectMapper.writeValue(stringEmp, this);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return stringEmp.toString();
}

use

public static ThisClass initFromJson(final String json) {
    final ObjectMapper mapper = new ObjectMapper();
    ThisClass item;
    try {
        item = mapper.readValue(json, ThisClass.class);
    } catch (IOException e) {
        return null;
    }

    return item;
}

to load the class from the json strings

If you have a Json object and don't have the Java fields for it, you might want to try http://timboudreau.com/blog/json/read to generate the Java code.